* Update apt.py
Proposing description of "cache_valid_time" for Ansible 2.4 or greater.
If 'cache_valid_time' is set, 'update_cache' is set implicitly.
This means the logic should be reversed.
label: docsite_pr
* Proposing the description of "cache_valid_time"..
This commit follows the discussion in #37972.
label: docsite_pr